well it is used for calculating numbers and would be useful but usually calculators are not used during exams as it is a basic rule for not using them !
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Naegele's Rule is a mathematical formula often used in pregnancy due date calculators. This is a formula that adds 7 days to the first LMP and then subtracting three months from that figure.
You will find that calculators are very good at answering such questions.When I used mine it told me the answer is:98765432090123456790.
Texas Instruments came up with the first calculators in the 1970's - so, Texas.
Blaise Pascal lived long before the invention of calculators.
One can find information on annuity calculators by going to the place that provides them. Examples of places that provide annuity calculators would be Bankrate, Aviva and LifeAnnuities.